io-wq: return next work from ->do_work() directly
It's easier to return next work from ->do_work() than
having an in-out argument. Looks nicer and easier to compile.
Also, merge io_wq_assign_next() into its only user.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index b628e44..2e44b37 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -895,7 +895,6 @@ enum io_mem_account {
ACCT_PINNED,
};
-static void io_wq_submit_work(struct io_wq_work **workptr);
static void io_cqring_fill_event(struct io_kiocb *req, long res);
static void io_put_req(struct io_kiocb *req);
static void io_double_put_req(struct io_kiocb *req);
@@ -1773,20 +1772,6 @@ static void io_free_req(struct io_kiocb *req)
}
}
-static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt)
-{
- struct io_kiocb *link;
- const struct io_op_def *def = &io_op_defs[nxt->opcode];
-
- if ((nxt->flags & REQ_F_ISREG) && def->hash_reg_file)
- io_wq_hash_work(&nxt->work, file_inode(nxt->file));
-
- *workptr = &nxt->work;
- link = io_prep_linked_timeout(nxt);
- if (link)
- nxt->flags |= REQ_F_QUEUE_TIMEOUT;
-}
-
/*
* Drop reference to request, return next in chain (if there is one) if this
* was the last reference to this request.
@@ -1806,24 +1791,29 @@ static void io_put_req(struct io_kiocb *req)
io_free_req(req);
}
-static void io_steal_work(struct io_kiocb *req,
- struct io_wq_work **workptr)
+static struct io_wq_work *io_steal_work(struct io_kiocb *req)
{
- /*
- * It's in an io-wq worker, so there always should be at least
- * one reference, which will be dropped in io_put_work() just
- * after the current handler returns.
- *
- * It also means, that if the counter dropped to 1, then there is
- * no asynchronous users left, so it's safe to steal the next work.
- */
- if (refcount_read(&req->refs) == 1) {
- struct io_kiocb *nxt = NULL;
+ struct io_kiocb *link, *nxt = NULL;
- io_req_find_next(req, &nxt);
- if (nxt)
- io_wq_assign_next(workptr, nxt);
- }
+ /*
+ * A ref is owned by io-wq in which context we're. So, if that's the
+ * last one, it's safe to steal next work. False negatives are Ok,
+ * it just will be re-punted async in io_put_work()
+ */
+ if (refcount_read(&req->refs) != 1)
+ return NULL;
+
+ io_req_find_next(req, &nxt);
+ if (!nxt)
+ return NULL;
+
+ if ((nxt->flags & REQ_F_ISREG) && io_op_defs[nxt->opcode].hash_reg_file)
+ io_wq_hash_work(&nxt->work, file_inode(nxt->file));
+
+ link = io_prep_linked_timeout(nxt);
+ if (link)
+ nxt->flags |= REQ_F_QUEUE_TIMEOUT;
+ return &nxt->work;
}
/*
@@ -5718,9 +5708,8 @@ static void io_arm_async_linked_timeout(struct io_kiocb *req)
io_queue_linked_timeout(link);
}
-static void io_wq_submit_work(struct io_wq_work **workptr)
+static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work)
{
- struct io_wq_work *work = *workptr;
struct io_kiocb *req = container_of(work, struct io_kiocb, work);
int ret = 0;
@@ -5751,7 +5740,7 @@ static void io_wq_submit_work(struct io_wq_work **workptr)
io_req_complete(req, ret);
}
- io_steal_work(req, workptr);
+ return io_steal_work(req);
}
static inline struct file *io_file_from_index(struct io_ring_ctx *ctx,
